Shingle (laminates) bundles on roof - How long?

How long can I leave these on the roof? They are in bundles plastic wrapped no more than 2 high - temperature in 60's, sometimes low 70's. They have been up there for 3 weeks so far and seem ok, a little sticky when hot but they separate ok when it cools down
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Mark wrote:

Yer pushin' it. Are you keeping them under a tarp, at least? Air temp isn't the problem, sunlight is. There is a reason lumber yard keeps these under roof. Unless the dots melt enough to get past the plastic guard strip, they should still work okay. A bigger concern is making a bowed spot in your decking or even a rafter- that is a lot of dead weight in one spot. And is rest of roof in tarpaper, or are you putting on a second layer? Neither is a really good idea- the tarpaper isn't supposed to be the weather roof for more than a few days, and overlays in general are to be avoided, for lots of reasons.
-- aem sends...
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Depends on where you live. I'm in NY & just finished up a bundle that I'd left on the garage roof in Nov 2002.
South facing roof- no shade- paper wrapped- 25 yr shingles. A couple that were just lying on the roof stuck where they weren't wanted-- but the bundle was intact & all the cellophane did its job. The shingles were even flexible enough to do the ridge cap with.
I think AEM is in TX-- probably a little warmer on his roof.<g>
Jim
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So what is it you're concerned about?
From your post and the replies I assume it's the condition of the shingles. But how about other damage to your roor or the potential damage to third parites if the shingles should slide, fall or blow away?
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About 35 years, give or take a week.
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